<template>
    <div class="goodsinfo-container">

        <transition
            @before-enter="beforeEnter"
            @enter="enter"
            @after-enter="afterEnter">
            <div class="ball" v-show="ballFlag" ref="ball"></div>
            <!-- ref 被用来给元素或子组件注册引用信息。引用信息将会注册在父组件的 $refs 对象上。
            如果在普通的 DOM 元素上使用，引用指向的就是 DOM 元素；如果用在子组件上，引用就指向组件实例： -->
        </transition>


        <!-- 商品轮播图区域 -->
       <div class="mui-card">
			<div class="mui-card-content">
				<swiper :lunbotuList="lunbotu"></swiper>
                <!-- <swiper :lunbotuList="lunbotu" :isFull="false"></swiper> -->
			</div>
		</div>
         

        <!-- 商品购买区域 -->
        <div class="mui-card">
			<div class="mui-card-header">{{goodsinfo.title}}</div>
			<div class="mui-card-content">
				<div class="mui-card-content-inner">
					<p class="price">
                        市场价：<del>￥{{goodsinfo.market_price}}</del>&nbsp;&nbsp;销售价：<span class="now_price">￥{{goodsinfo.sell_price}}</span>
                    </p>
                    <p>购买数量：</p>
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addToshopcar()">加入购物车</mt-button>
                        <numbox style="float:right" @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>               
                    </p>
				</div>
			</div>
		</div>



        <!-- 商品参数区域 -->
        <div class="mui-card">
			<div class="mui-card-header"></div>
			<div class="mui-card-content">
				<div class="mui-card-content-inner">
					<p>商品货号：{{goodsinfo.goods_mo}}</p>
                    <p>库存情况：{{goodsinfo.stock_quantity}}</p>
                    <p>上架时间：{{goodsinfo.add_time|dateFormat}}</p>
				</div>
			</div>
			<div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
		</div>

    </div>

</template>

<script>
import swiper from '../subcomponents/swiper.vue'
import numbox from '../subcomponents/goodsinfo_numbox.vue'
export default {
    data(){
        return {
            id:this.$route.params.id,
            lunbotu:[],
            goodsinfo:[],
            ballFlag:false,//控制小球的隐藏和显示标识符
            selectedCount:1//用户默认选中的数量
        }
    },
    created(){
        this.getLunbotu();
        this.getGoodsInfo();
    },
    methods:{
        getLunbotu(){
            this.$http.get('api/getthumimages/'+this.id).then(result=>{
                if(result.body.status===0) {
                    console.log(result.body)//这里的数据是src，子组件不能识别item.src需要把循环每一项把src赋值给img(添加一个img属性)
                    this.lunbotu=result.body.message;
                }
            })
        },
        getGoodsInfo(){
            this.$http.get('api/goods/getinfo/'+this.id).then(result=>{
                if(result.body.status===0) {
                    console.log(result.body.message)
                    this.goodsinfo=result.body.message[0]
                }
            })
        },
        goDesc(id) {
            this.$router.push({name:'goodsdesc',params:{id}})
        },
        goComment(id) {
            this.$router.push({name:'goodscomment',params:{id}})
        },
        addToshopcar(){
            this.ballFlag=!this.ballFlag;
            //点击加入购物车的时候在该方法中拼接处car数组里的商品信息对象；
            var goodsinfo={
                id:this.id,
                count:this.selectedCount,
                price:this.goodsinfo.sell_price,
                selected:true
            }
            this.$store.commit('addToCar',goodsinfo);
        },
        //el表示要执行动画的那个dom元素，是原生js Dom对象
        beforeEnter(el) {
           el.style.transform="translate(0,0)";//设置动画开始前的初始位置
        },
        enter(el,done) {
            //刷新动画效果
            el.offsetWidth;

            //获取小球在页面中的位置
            const ballPosition=this.$refs.ball.getBoundingClientRect();
            //获取徽标在页面中的位置
            const badgePosition=document.getElementById("badge").getBoundingClientRect();

            const xDist=badgePosition.left-ballPosition.left;
            const yDist=badgePosition.top-ballPosition.top;

            
            //动画完成后的样式
            el.style.transform=`translate(${xDist}px,${yDist}px)`;

            //动画持续的时间
            el.style.transition="all .5s cubic-bezier(.4,-0.3,1,.68)";
            //done其实是afterEnter的引用
            done();
        },
        afterEnter(el){
            //动画完成之后调用
            this.ballFlag=!this.ballFlag;
        },
        getSelectedCount(count){
            this.selectedCount=count;//
            // console.log('父组件拿到的数量值为：'+this.selectedCount);
        }

    },
    components:{
        swiper:swiper,
        numbox:numbox
    }
}
</script>

<style lang="scss" scoped>
    .goodsinfo-container {
        background-color: #eee;
        overflow: hidden;
    }
    .now_price {
        color: red;
        font-weight: 700;
    }
    .mui-card-footer {
        display:block;
        button{
            margin: 15px 0;
        }
    }
    .ball {
        position: absolute;
        top: 392px;
        left: 282px;
        background-color: red;
        width: 15px;
        height: 15px;
        z-index: 999;
        border-radius: 50%;
    }
</style>
